Spindle press



H. HANY SPINDLE PRESS June 25, 1968 Sheets-Sheet 1 Filed Oct. 4, 1966HARALD HANY INVENTOR.

H. HANY SPINDLE PRESS 5 Sheets-Sheet 2 HARALD H/Vy I N VEN TOR.

B ,I (B OS ew* g' Attorney June 25, 1968 Filed oct. 4. 196e June 25,1968 H, HANY 3,389,653

SPINDLE PRESS Filed OC. 4, 1966 5 SheetS-Sheet 3 will O) 0) Illu (DHARALD H/M/Y INVENTOR.

BY s* United States Patent Oce 3,389,653 SPINDLE PRESS Harald' Hany,Kassel-Wilhelmsliohe, Germany, assignor to Firma Franz Berrenberg, Haan,Rhineland, Germany, a corporation of Germany Filed Oct. 4, 1966, Ser.No. 584,269 Claims priority, application Germany, Oct. 16, 1965,

7 claims. (ci. 10o- 214) ABSTRACT F THE DISCLOSURE A spindle press inwhich a ram has upstanding front and rear wings which bracket across-piece of the frame and have vertical edges in sliding contact withthat crosspiece; these wings have a height greater than a vertical yramstroke to straddle the cross-piece in Itop and bottom positions of thespindle, the frame having a pair of uprights with the cross-pieceattached to their upper ends. The uprights and cross-piece have alignedfront and rear shoulders constituting vertical guideways for the ram.

My present invention relates to a spindle press of the general typedescribed, for example, in commonly assigned application Ser. No.550,208, tiled May 16, 1966, by Volker Stille and me.

In such press a spindle is mounted, generally vertically, in a framewhich threadedly engages, usually through the intermediary of astationary nut, so as Ito move up and down upon being reversiblyrotated, the lower end of the spindle carrying a ram to be brought intocontact with a, workpiece carried on the press frame. In order to impartsuch reversible rotation to the spindle, the latter is rigid with adriven disk which is frictionally engageable by either one of twodriving disks flanking the spindle. The driving disks can thus bejointly and continuously rotated by an appropriate power source, such asan electric motor, so that a large torque is instantly available fortransmission -to the driven disk as soon as the latter makes contactwith one of the driving disks; as the spindle descends, the driven diskengages the cooperating driving disk along an ever-increasing radius soas to be progressively accelerated during the working stroke of the ram.

If a press of this description is to produce a large output, the motionof the spindle must be reversed at a rapid rate. Such rapid reversals,however, are possible only if the spindle and its ram Atogether have alow inertia, this in turn calling for a ram of limited height. On theother hand, it is necessary that the ram be accurately guided on thepress frame, such guidance being diliicult to achieve with rams of shortaxial length.

My presen-t invention, accordingly, has for its object the provision ofan improved ram construction which affords accurate guidance whileallowing a substantial reduction in the overall dimensions and,therefore, the weight of vthe ram as compared with conventional pressesof this type.

The above object is realized, pursuant to my present invention, by theprovision of a ram having upstanding front and rear wings which bracketa cross-piece of the frame and have vertical edges in sliding contactwith that cross-piece, these wings advantageously having a heightgreater than a vertical ram stroke so as to straddle the cross-piece inboth a top and a bot-tom position of the spindle.

`In a preferred embodiment, pursuant to a further feature of myinvention, the frame comprises a pair of uprights having the cross-piecexed to their upper ends, the uprights and the cross-piece being formedwith align-ed front and rear shoulders which constitute vertical guide-3,339,653 Patented June 25, 1958' ways for the ram. Advantageously,these guideways accommodate respective guide -rails for the ram whichspan both the uprights and the cross-piece so as to avoid anydiscontinuity along the ram stroke.

The above and other features of my invention will become more fullyapparent from the following detailed description, reference being madeto the accompanying drawing in which:

FIG. 1 is a front-elevational view of a spindle press embodying theinvention;

FIG. 2 is a cross-sectional view, drawn to a larger scale, on the lineII-II of FIG. 1;

IFIG. 3 is a sectional elevational view taken on the line -III-II\I ofFIG. l;

FIG. 4 is a cross-sectional view drawn to substantially the same scaleas FIG. 2 and taken on`the line IVAIV of FIG. 1; and

FIG. 5 is a side-elevational view of a ram forming part of the pressshown in FIGS. 1-4.

The press shown in the drawing comprises a frame with a pair of uprights1 bridged by -a cross-piece 2. Lodged centrally in this cross-piece is aiixed nut 4 threadedly receiving a vertical spindle `5 whose lower endis rigid with a ring `9 held axially between a pair of thrust bearings 7and I10. The bearings are seated in a ram 6, upper bearing 7 beinglocked in position by a collar 8 which is fastened to the ram by screws8'. Tie rods =3 extend y vertically within the uprights y1 and haveheads 3 bearing upon the cross-piece 2, `their lower `ends 'beingsecured by nuts 61 to a base 60 forming par-t of the press frame.

The ram 6 is of generally cup-shaped configuration and has a bottom 14of limited thickness integral with a pair of upstanding front .and rearwings 115. These wings bracket confronting cylindrical outer surfaces 2'of the cross-piece 2, centered on the axis of spindle 5r, and are insliding contact with both the cross-piece 2 and the uprights 1. Thissliding contact takes place through the intermediary of a set of railsL22 of triangular profile, resting against `aligned ront and rearshoulders 20, 20a of the cross-piece and the uprights, and vertical bars23 of square prole which are rigid with the ram and are received inV-grooves 17 along the lateral edges of the wings 15. The rails 22extend over the full stroke length of the ram which is so dimensionedthat the wings -15 still straddle the cross-piece 2 in the lowermostspindle position in which the ram bottom 14 is at a level shown indot-dash lines in FIG. 1. The guide surfaces of these rails, contactedby the bars 23, lie in generally diagonal vertical planes which passclose to the axis of spindle 5. The ram bottom 11i has a central recess16 for the attachment of tools designed to deform a workpiece resting onthe bed 16. Guard strips 2'4 are secured to the crossepiece 2 by screws24 and overlie the bars 23 which in turn are attached to the ram 6 'bycountersunk screws 23' received in threaded bores `27.

The tube of spindle 5 is rigid with a driven disk 11 alternatelyengageable by a pair of driving disks 29a, 29b on a horizontal shaft'30; the unit 29a, 2%, 30 is journaled in xed bearings `5-1 atop theframe 1, 2 and is axially shiftable for selective frictional contact ofdisk di with either of disks 29a, 29b. In operation, the unit 29a, 2%,30 is continuously rotated by a drive motor 513 via a belt 54 on disk2gb.

As seen most clearly in F'IG. 5, the ram 6 has lateral cutou-ts 28separating the wings=15 from each other. The wings are formed with largeopenings 13 which further reduce the weight of the ram and facilitatevisual inspection of the spindle |5 at the point of its emergence fromnut 4.

Only the rails 22, forming -continuous guideways for the ram, the' bars23 in contact therewith and the associated guard strips 24 need toconsist of highly polished bearing metals; the other surfaces of the ramand the frame do not require special machining.

Transparent window panes 1'3' of lightweight material in openings 13enable the wings 15 to act as shields which intercept outwardlysquirting oil during reciprocation of the ram.

lIt will be apparent that even substantial eccentric stresses exertedupon the ram will tbe absorbed by the slidable mounting described andillustrated so that no wedging or jamming of the reciprocating assemblywill occur.

I claim:

1. In a spindle press, in combination, a frame comprising a pair oflateral uprights and a cross-piece bridging said uprights; a verticalspindle lianked by said uprights and threadedly received in saidcross-piece for coordinated rotation and vertical motion; drive meanssupported on sai-d frame for reversibly rotating and thereby alternatelylowering and raising said spindle between a top position and a bottompositiont hereof; and a Vertically movable ram mounted on the lower endof said spindle for vertical entrainrnent thereby, said ram beingprovided with upstanding front and rear wings bracketing saidcross-piece and having vertical edges in sliding contact with the latterand with said uprights.

2. The combination deiined in claim 1 wherein said wings have a heightgreater than the vertical stroke of said ram, thereby straddling saidcrossapiece in both said top and bottom positions of said spindle.

`3. The combination defined in claim 1 wherein said cross-piece is xedto the uper ends of said uprights, said uprights and said cross-piecebeing formed with aligned front and rear shoulders constituting verticalguideways for said ram.

4. The combination defined in claim 3, further comprising a set ofvertical guide rails for said ram iixedly received in said guideways andspanning the respective uprights and said cross-piece.

5. The combination delined in claim 4 wherein said guide rails haveram-engaging faces lying in generally diagonal vertical planes.

6. The combination de'lined in claim 5, further comprising a set ofguard strips carried on Said cross-piece and forming vertical guidechannels with said ram-engaging faces of said rails, said ram beingprovided with front and rear lateral projections respectively receivedin said channels.

7. The combination defined in claim 6 wherein said projections areformed by vertical bars of substantially square proiile rigid with saidram.

References Cited UNITED STATES PATENTS 2,491,384 12/1949 MacMillin30S-13 2,523,393 9/1950 Rhodes 10G-214 XR 2,384,160 9/ 1945 Ernst10D-214 X R 3,044,138 7/1962 Lesnett et al. 10U-289 XP FOREIGN PATENTS839,572 6/1960 Great Britain.

BILLY I. WILHITE, Primary Examiner.

